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<title>The MPL Reference Manual: zip_view</title>
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<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./sequences.html" class="navigation-link">Sequences</a> / <a href="./views.html" class="navigation-link">Views</a> / <a href="./zip-view.html" class="navigation-link">zip_view</a></td>
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<div class="section" id="zip-view">
<h1><a class="toc-backref" href="./views.html#id1423">zip_view</a></h1>
<div class="section" id="id167">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
template&lt;
      typename <a href="./sequences.html" class="identifier">Sequences</a>
    &gt;
struct <a href="./zip-view.html" class="identifier">zip_view</a>
{
    // <em>unspecified</em>
    // <em>...</em>
};
</pre>
</div>
<div class="section" id="id168">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p>Provides a &quot;zipped&quot; view onto several sequences; that is, represents several
sequences as a single sequence of elements each of which, in turn,
is a sequence of the corresponding <tt class="literal"><span class="pre"><a href="./sequences.html" class="identifier">Sequences</a></span></tt>' elements.</p>
</div>
<div class="section" id="id169">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/zip_view.hpp" class="header">boost/mpl/zip_view.hpp</a>&gt;
</pre>
</div>
<div class="section" id="id170">
<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
<ul class="simple">
<li><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></li>
</ul>
</div>
<div class="section" id="id171">
<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
<table border="1" class="docutils table">
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<col width="19%" />
<col width="43%" />
<col width="38%" />
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<tr><th class="head">Parameter</th>
<th class="head">Requirement</th>
<th class="head">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="literal"><span class="pre"><a href="./sequences.html" class="identifier">Sequences</a></span></tt></td>
<td>A <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> of
<a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>s</td>
<td>Sequences to be &quot;zipped&quot;.</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="id172">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>The semantics of an expression are defined only
where they differ from, or are not defined in <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>.</p>
<p>In the following table, <tt class="literal"><span class="pre">v</span></tt> is an instance of <tt class="literal"><span class="pre"><a href="./zip-view.html" class="identifier">zip_view</a></span></tt>, <tt class="literal"><span class="pre">seq</span></tt> a <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> of <tt class="literal"><span class="pre">n</span></tt>
<a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>s.</p>
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<tr><th class="head">Expression</th>
<th class="head">Semantics</th>
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<tr><td><pre class="first last literal-block">
<a href="./zip-view.html" class="identifier">zip_view</a>&lt;seq&gt;
<a href="./zip-view.html" class="identifier">zip_view</a>&lt;seq&gt;::type
</pre>
</td>
<td>A lazy <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">v</span></tt> such that for each <tt class="literal"><span class="pre">i</span></tt>
in [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;v&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;v&gt;::type</span></tt>) and for each <tt class="literal"><span class="pre">j</span></tt> in
[<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;seq&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;seq&gt;::type</span></tt>)
<tt class="literal"><span class="pre"><a href="./deref.html" class="identifier">deref</a>&lt;i&gt;::type</span></tt> is identical to
<tt class="literal"><span class="pre"><a href="./transform.html" class="identifier">transform</a>&lt;</span> <span class="pre"><a href="./deref.html" class="identifier">deref</a>&lt;j&gt;::type,</span> <span class="pre"><a href="./deref.html" class="identifier">deref</a>&lt;<a href="./placeholders.html" class="identifier">_1</a>&gt;</span> <span class="pre">&gt;::type</span></tt>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;v&gt;::type</span></tt></td>
<td><p class="first">The size of <tt class="literal"><span class="pre">v</span></tt>; <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;v&gt;::value</span></tt> is equal to</p>
<pre class="literal-block">
<a href="./deref.html" class="identifier">deref</a>&lt; <a href="./min-element.html" class="identifier">min_element</a>&lt;
      <a href="./transform-view.html" class="identifier">transform_view</a>&lt; seq, <a href="./size.html" class="identifier">size</a>&lt;<a href="./placeholders.html" class="identifier">_1</a>&gt; &gt;
    &gt;::type &gt;::type::value;
</pre>
<p class="last">linear complexity; see <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>.</p>
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</div>
<div class="section" id="id173">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<p>Element-wise sum of three vectors.</p>
<pre class="literal-block">
typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,2,3,4,5&gt; v1;
typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,5,4,3,2,1&gt; v2;
typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,1,1,1,1&gt; v3;

typedef <a href="./transform-view.html" class="identifier">transform_view</a>&lt;
      <a href="./zip-view.html" class="identifier">zip_view</a>&lt; <a href="./vector.html" class="identifier">vector</a>&lt;v1,v2,v3&gt; &gt;
    , <a href="./unpack-args.html" class="identifier">unpack_args</a>&lt; <a href="./plus.html" class="identifier">plus</a>&lt;<a href="./placeholders.html" class="identifier">_1</a>,<a href="./placeholders.html" class="identifier">_2</a>,<a href="./placeholders.html" class="identifier">_3</a>&gt; &gt;
    &gt; sum;

<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>&lt; sum, <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,7,7,7,7,7&gt; > ));
</pre>
</div>
<div class="section" id="id174">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./views.html">Views</a>, <a class="reference internal" href="./filter-view.html">filter_view</a>, <a class="reference internal" href="./transform-view.html">transform_view</a>, <a class="reference internal" href="./joint-view.html">joint_view</a>, <a class="reference internal" href="./single-view.html">single_view</a>, <a class="reference internal" href="./iterator-range.html">iterator_range</a></p>
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